Migrate SOLR custom fields to the new UI framework

SOLR is including some Search templates that use custom fields: info.magnolia.search.solrsearchprovider.ui.form.field.definition.ClientSelectFieldDefinition} and info.magnolia.search.solrsearchprovider.ui.form.field.definition.FacetSelectFieldDefinition. When a Page is created using MTE-Solr Search Result template, the client cannot be chosen because the field is not supported by the new UI Framework and no Converter exists for these custom fields.

Steps to reproduce:
1. Install SOLR (v5.2.3)
2. Create a page using template MTE-Solr Search Result. This is the page dialog that is displayed:

Expected result:
It is expected that this field is supported and the client and all the needed configuration can be set up via dialog.

Actual result:
client cannot be chosen

Workaround:
In the Client field select which client should be used for search. The field displays all clients configured under Configuration > /modules/solr-search-provider/config/solrClientConfigs.

Save the page without selecting the client and set it up directly in JCR Browser. First, see available clients configured under Configuration > /modules/solr-search-provider/config/solrClientConfigs.